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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / tools / perf / util / evsel.c
bloba69e64236120a7d4c8bf4ceb84434a439b51f6ac
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
4 *
5 * Parts came from builtin-{top,stat,record}.c, see those files for further
6 * copyright notes.
7 */
8
9 #include <byteswap.h>
10 #include <errno.h>
11 #include <inttypes.h>
12 #include <linux/bitops.h>
13 #include <api/fs/fs.h>
14 #include <api/fs/tracing_path.h>
15 #include <traceevent/event-parse.h>
16 #include <linux/hw_breakpoint.h>
17 #include <linux/perf_event.h>
18 #include <linux/compiler.h>
19 #include <linux/err.h>
20 #include <linux/zalloc.h>
21 #include <sys/ioctl.h>
22 #include <sys/resource.h>
23 #include <sys/types.h>
24 #include <dirent.h>
25 #include <stdlib.h>
26 #include <perf/evsel.h>
27 #include "asm/bug.h"
28 #include "callchain.h"
29 #include "cgroup.h"
30 #include "counts.h"
31 #include "event.h"
32 #include "evsel.h"
33 #include "util/env.h"
34 #include "util/evsel_config.h"
35 #include "util/evsel_fprintf.h"
36 #include "evlist.h"
37 #include <perf/cpumap.h>
38 #include "thread_map.h"
39 #include "target.h"
40 #include "perf_regs.h"
41 #include "record.h"
42 #include "debug.h"
43 #include "trace-event.h"
44 #include "stat.h"
45 #include "string2.h"
46 #include "memswap.h"
47 #include "util.h"
48 #include "../perf-sys.h"
49 #include "util/parse-branch-options.h"
50 #include <internal/xyarray.h>
51 #include <internal/lib.h>
52
53 #include <linux/ctype.h>
54
55 struct perf_missing_features perf_missing_features;
56
57 static clockid_t clockid;
58
59 static int perf_evsel__no_extra_init(struct evsel *evsel __maybe_unused)
60 {
61 return 0;
62 }
63
64 void __weak test_attr__ready(void) { }
65
66 static void perf_evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
67 {
68 }
69
70 static struct {
71 size_t size;
72 int (*init)(struct evsel *evsel);
73 void (*fini)(struct evsel *evsel);
74 } perf_evsel__object = {
75 .size = sizeof(struct evsel),
76 .init = perf_evsel__no_extra_init,
77 .fini = perf_evsel__no_extra_fini,
78 };
79
80 int perf_evsel__object_config(size_t object_size,
81 int (*init)(struct evsel *evsel),
82 void (*fini)(struct evsel *evsel))
83 {
84
85 if (object_size == 0)
86 goto set_methods;
87
88 if (perf_evsel__object.size > object_size)
89 return -EINVAL;
90
91 perf_evsel__object.size = object_size;
92
93 set_methods:
94 if (init != NULL)
95 perf_evsel__object.init = init;
96
97 if (fini != NULL)
98 perf_evsel__object.fini = fini;
99
100 return 0;
101 }
102
103 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
104
105 int __perf_evsel__sample_size(u64 sample_type)
106 {
107 u64 mask = sample_type & PERF_SAMPLE_MASK;
108 int size = 0;
109 int i;
110
111 for (i = 0; i < 64; i++) {
112 if (mask & (1ULL << i))
113 size++;
114 }
115
116 size *= sizeof(u64);
117
118 return size;
119 }
120
121 /**
122 * __perf_evsel__calc_id_pos - calculate id_pos.
123 * @sample_type: sample type
124 *
125 * This function returns the position of the event id (PERF_SAMPLE_ID or
126 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
127 * perf_record_sample.
128 */
129 static int __perf_evsel__calc_id_pos(u64 sample_type)
130 {
131 int idx = 0;
132
133 if (sample_type & PERF_SAMPLE_IDENTIFIER)
134 return 0;
135
136 if (!(sample_type & PERF_SAMPLE_ID))
137 return -1;
138
139 if (sample_type & PERF_SAMPLE_IP)
140 idx += 1;
141
142 if (sample_type & PERF_SAMPLE_TID)
143 idx += 1;
144
145 if (sample_type & PERF_SAMPLE_TIME)
146 idx += 1;
147
148 if (sample_type & PERF_SAMPLE_ADDR)
149 idx += 1;
150
151 return idx;
152 }
153
154 /**
155 * __perf_evsel__calc_is_pos - calculate is_pos.
156 * @sample_type: sample type
157 *
158 * This function returns the position (counting backwards) of the event id
159 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
160 * sample_id_all is used there is an id sample appended to non-sample events.
161 */
162 static int __perf_evsel__calc_is_pos(u64 sample_type)
163 {
164 int idx = 1;
165
166 if (sample_type & PERF_SAMPLE_IDENTIFIER)
167 return 1;
168
169 if (!(sample_type & PERF_SAMPLE_ID))
170 return -1;
171
172 if (sample_type & PERF_SAMPLE_CPU)
173 idx += 1;
174
175 if (sample_type & PERF_SAMPLE_STREAM_ID)
176 idx += 1;
177
178 return idx;
179 }
180
181 void perf_evsel__calc_id_pos(struct evsel *evsel)
182 {
183 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
184 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
185 }
186
187 void __perf_evsel__set_sample_bit(struct evsel *evsel,
188 enum perf_event_sample_format bit)
189 {
190 if (!(evsel->core.attr.sample_type & bit)) {
191 evsel->core.attr.sample_type |= bit;
192 evsel->sample_size += sizeof(u64);
193 perf_evsel__calc_id_pos(evsel);
194 }
195 }
196
197 void __perf_evsel__reset_sample_bit(struct evsel *evsel,
198 enum perf_event_sample_format bit)
199 {
200 if (evsel->core.attr.sample_type & bit) {
201 evsel->core.attr.sample_type &= ~bit;
202 evsel->sample_size -= sizeof(u64);
203 perf_evsel__calc_id_pos(evsel);
204 }
205 }
206
207 void perf_evsel__set_sample_id(struct evsel *evsel,
208 bool can_sample_identifier)
209 {
210 if (can_sample_identifier) {
211 perf_evsel__reset_sample_bit(evsel, ID);
212 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
213 } else {
214 perf_evsel__set_sample_bit(evsel, ID);
215 }
216 evsel->core.attr.read_format |= PERF_FORMAT_ID;
217 }
218
219 /**
220 * perf_evsel__is_function_event - Return whether given evsel is a function
221 * trace event
222 *
223 * @evsel - evsel selector to be tested
224 *
225 * Return %true if event is function trace event
226 */
227 bool perf_evsel__is_function_event(struct evsel *evsel)
228 {
229 #define FUNCTION_EVENT "ftrace:function"
230
231 return evsel->name &&
232 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
233
234 #undef FUNCTION_EVENT
235 }
236
237 void evsel__init(struct evsel *evsel,
238 struct perf_event_attr *attr, int idx)
239 {
240 perf_evsel__init(&evsel->core, attr);
241 evsel->idx = idx;
242 evsel->tracking = !idx;
243 evsel->leader = evsel;
244 evsel->unit = "";
245 evsel->scale = 1.0;
246 evsel->max_events = ULONG_MAX;
247 evsel->evlist = NULL;
248 evsel->bpf_obj = NULL;
249 evsel->bpf_fd = -1;
250 INIT_LIST_HEAD(&evsel->config_terms);
251 perf_evsel__object.init(evsel);
252 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
253 perf_evsel__calc_id_pos(evsel);
254 evsel->cmdline_group_boundary = false;
255 evsel->metric_expr = NULL;
256 evsel->metric_name = NULL;
257 evsel->metric_events = NULL;
258 evsel->collect_stat = false;
259 evsel->pmu_name = NULL;
260 }
261
262 struct evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
263 {
264 struct evsel *evsel = zalloc(perf_evsel__object.size);
265
266 if (!evsel)
267 return NULL;
268 evsel__init(evsel, attr, idx);
269
270 if (perf_evsel__is_bpf_output(evsel)) {
271 evsel->core.attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
272 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
273 evsel->core.attr.sample_period = 1;
274 }
275
276 if (perf_evsel__is_clock(evsel)) {
277 /*
278 * The evsel->unit points to static alias->unit
279 * so it's ok to use static string in here.
280 */
281 static const char *unit = "msec";
282
283 evsel->unit = unit;
284 evsel->scale = 1e-6;
285 }
286
287 return evsel;
288 }
289
290 static bool perf_event_can_profile_kernel(void)
291 {
292 return perf_event_paranoid_check(1);
293 }
294
295 struct evsel *perf_evsel__new_cycles(bool precise)
296 {
297 struct perf_event_attr attr = {
298 .type = PERF_TYPE_HARDWARE,
299 .config = PERF_COUNT_HW_CPU_CYCLES,
300 .exclude_kernel = !perf_event_can_profile_kernel(),
301 };
302 struct evsel *evsel;
303
304 event_attr_init(&attr);
305
306 if (!precise)
307 goto new_event;
308
309 /*
310 * Now let the usual logic to set up the perf_event_attr defaults
311 * to kick in when we return and before perf_evsel__open() is called.
312 */
313 new_event:
314 evsel = evsel__new(&attr);
315 if (evsel == NULL)
316 goto out;
317
318 evsel->precise_max = true;
319
320 /* use asprintf() because free(evsel) assumes name is allocated */
321 if (asprintf(&evsel->name, "cycles%s%s%.*s",
322 (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
323 attr.exclude_kernel ? "u" : "",
324 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
325 goto error_free;
326 out:
327 return evsel;
328 error_free:
329 evsel__delete(evsel);
330 evsel = NULL;
331 goto out;
332 }
333
334 /*
335 * Returns pointer with encoded error via <linux/err.h> interface.
336 */
337 struct evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
338 {
339 struct evsel *evsel = zalloc(perf_evsel__object.size);
340 int err = -ENOMEM;
341
342 if (evsel == NULL) {
343 goto out_err;
344 } else {
345 struct perf_event_attr attr = {
346 .type = PERF_TYPE_TRACEPOINT,
347 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
348 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
349 };
350
351 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
352 goto out_free;
353
354 evsel->tp_format = trace_event__tp_format(sys, name);
355 if (IS_ERR(evsel->tp_format)) {
356 err = PTR_ERR(evsel->tp_format);
357 goto out_free;
358 }
359
360 event_attr_init(&attr);
361 attr.config = evsel->tp_format->id;
362 attr.sample_period = 1;
363 evsel__init(evsel, &attr, idx);
364 }
365
366 return evsel;
367
368 out_free:
369 zfree(&evsel->name);
370 free(evsel);
371 out_err:
372 return ERR_PTR(err);
373 }
374
375 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
376 "cycles",
377 "instructions",
378 "cache-references",
379 "cache-misses",
380 "branches",
381 "branch-misses",
382 "bus-cycles",
383 "stalled-cycles-frontend",
384 "stalled-cycles-backend",
385 "ref-cycles",
386 };
387
388 static const char *__perf_evsel__hw_name(u64 config)
389 {
390 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
391 return perf_evsel__hw_names[config];
392
393 return "unknown-hardware";
394 }
395
396 static int perf_evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
397 {
398 int colon = 0, r = 0;
399 struct perf_event_attr *attr = &evsel->core.attr;
400 bool exclude_guest_default = false;
401
402 #define MOD_PRINT(context, mod) do { \
403 if (!attr->exclude_##context) { \
404 if (!colon) colon = ++r; \
405 r += scnprintf(bf + r, size - r, "%c", mod); \
406 } } while(0)
407
408 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
409 MOD_PRINT(kernel, 'k');
410 MOD_PRINT(user, 'u');
411 MOD_PRINT(hv, 'h');
412 exclude_guest_default = true;
413 }
414
415 if (attr->precise_ip) {
416 if (!colon)
417 colon = ++r;
418 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
419 exclude_guest_default = true;
420 }
421
422 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
423 MOD_PRINT(host, 'H');
424 MOD_PRINT(guest, 'G');
425 }
426 #undef MOD_PRINT
427 if (colon)
428 bf[colon - 1] = ':';
429 return r;
430 }
431
432 static int perf_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
433 {
434 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->core.attr.config));
435 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
436 }
437
438 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
439 "cpu-clock",
440 "task-clock",
441 "page-faults",
442 "context-switches",
443 "cpu-migrations",
444 "minor-faults",
445 "major-faults",
446 "alignment-faults",
447 "emulation-faults",
448 "dummy",
449 };
450
451 static const char *__perf_evsel__sw_name(u64 config)
452 {
453 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
454 return perf_evsel__sw_names[config];
455 return "unknown-software";
456 }
457
458 static int perf_evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
459 {
460 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->core.attr.config));
461 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
462 }
463
464 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
465 {
466 int r;
467
468 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
469
470 if (type & HW_BREAKPOINT_R)
471 r += scnprintf(bf + r, size - r, "r");
472
473 if (type & HW_BREAKPOINT_W)
474 r += scnprintf(bf + r, size - r, "w");
475
476 if (type & HW_BREAKPOINT_X)
477 r += scnprintf(bf + r, size - r, "x");
478
479 return r;
480 }
481
482 static int perf_evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
483 {
484 struct perf_event_attr *attr = &evsel->core.attr;
485 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
486 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
487 }
488
489 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
490 [PERF_EVSEL__MAX_ALIASES] = {
491 { "L1-dcache", "l1-d", "l1d", "L1-data", },
492 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
493 { "LLC", "L2", },
494 { "dTLB", "d-tlb", "Data-TLB", },
495 { "iTLB", "i-tlb", "Instruction-TLB", },
496 { "branch", "branches", "bpu", "btb", "bpc", },
497 { "node", },
498 };
499
500 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
501 [PERF_EVSEL__MAX_ALIASES] = {
502 { "load", "loads", "read", },
503 { "store", "stores", "write", },
504 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
505 };
506
507 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
508 [PERF_EVSEL__MAX_ALIASES] = {
509 { "refs", "Reference", "ops", "access", },
510 { "misses", "miss", },
511 };
512
513 #define C(x) PERF_COUNT_HW_CACHE_##x
514 #define CACHE_READ (1 << C(OP_READ))
515 #define CACHE_WRITE (1 << C(OP_WRITE))
516 #define CACHE_PREFETCH (1 << C(OP_PREFETCH))
517 #define COP(x) (1 << x)
518
519 /*
520 * cache operartion stat
521 * L1I : Read and prefetch only
522 * ITLB and BPU : Read-only
523 */
524 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
525 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
526 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
527 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
528 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
529 [C(ITLB)] = (CACHE_READ),
530 [C(BPU)] = (CACHE_READ),
531 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
532 };
533
534 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
535 {
536 if (perf_evsel__hw_cache_stat[type] & COP(op))
537 return true; /* valid */
538 else
539 return false; /* invalid */
540 }
541
542 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
543 char *bf, size_t size)
544 {
545 if (result) {
546 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
547 perf_evsel__hw_cache_op[op][0],
548 perf_evsel__hw_cache_result[result][0]);
549 }
550
551 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
552 perf_evsel__hw_cache_op[op][1]);
553 }
554
555 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
556 {
557 u8 op, result, type = (config >> 0) & 0xff;
558 const char *err = "unknown-ext-hardware-cache-type";
559
560 if (type >= PERF_COUNT_HW_CACHE_MAX)
561 goto out_err;
562
563 op = (config >> 8) & 0xff;
564 err = "unknown-ext-hardware-cache-op";
565 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
566 goto out_err;
567
568 result = (config >> 16) & 0xff;
569 err = "unknown-ext-hardware-cache-result";
570 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
571 goto out_err;
572
573 err = "invalid-cache";
574 if (!perf_evsel__is_cache_op_valid(type, op))
575 goto out_err;
576
577 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
578 out_err:
579 return scnprintf(bf, size, "%s", err);
580 }
581
582 static int perf_evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
583 {
584 int ret = __perf_evsel__hw_cache_name(evsel->core.attr.config, bf, size);
585 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
586 }
587
588 static int perf_evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
589 {
590 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
591 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
592 }
593
594 static int perf_evsel__tool_name(char *bf, size_t size)
595 {
596 int ret = scnprintf(bf, size, "duration_time");
597 return ret;
598 }
599
600 const char *perf_evsel__name(struct evsel *evsel)
601 {
602 char bf[128];
603
604 if (!evsel)
605 goto out_unknown;
606
607 if (evsel->name)
608 return evsel->name;
609
610 switch (evsel->core.attr.type) {
611 case PERF_TYPE_RAW:
612 perf_evsel__raw_name(evsel, bf, sizeof(bf));
613 break;
614
615 case PERF_TYPE_HARDWARE:
616 perf_evsel__hw_name(evsel, bf, sizeof(bf));
617 break;
618
619 case PERF_TYPE_HW_CACHE:
620 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
621 break;
622
623 case PERF_TYPE_SOFTWARE:
624 if (evsel->tool_event)
625 perf_evsel__tool_name(bf, sizeof(bf));
626 else
627 perf_evsel__sw_name(evsel, bf, sizeof(bf));
628 break;
629
630 case PERF_TYPE_TRACEPOINT:
631 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
632 break;
633
634 case PERF_TYPE_BREAKPOINT:
635 perf_evsel__bp_name(evsel, bf, sizeof(bf));
636 break;
637
638 default:
639 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
640 evsel->core.attr.type);
641 break;
642 }
643
644 evsel->name = strdup(bf);
645
646 if (evsel->name)
647 return evsel->name;
648 out_unknown:
649 return "unknown";
650 }
651
652 const char *perf_evsel__group_name(struct evsel *evsel)
653 {
654 return evsel->group_name ?: "anon group";
655 }
656
657 /*
658 * Returns the group details for the specified leader,
659 * with following rules.
660 *
661 * For record -e '{cycles,instructions}'
662 * 'anon group { cycles:u, instructions:u }'
663 *
664 * For record -e 'cycles,instructions' and report --group
665 * 'cycles:u, instructions:u'
666 */
667 int perf_evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
668 {
669 int ret = 0;
670 struct evsel *pos;
671 const char *group_name = perf_evsel__group_name(evsel);
672
673 if (!evsel->forced_leader)
674 ret = scnprintf(buf, size, "%s { ", group_name);
675
676 ret += scnprintf(buf + ret, size - ret, "%s",
677 perf_evsel__name(evsel));
678
679 for_each_group_member(pos, evsel)
680 ret += scnprintf(buf + ret, size - ret, ", %s",
681 perf_evsel__name(pos));
682
683 if (!evsel->forced_leader)
684 ret += scnprintf(buf + ret, size - ret, " }");
685
686 return ret;
687 }
688
689 static void __perf_evsel__config_callchain(struct evsel *evsel,
690 struct record_opts *opts,
691 struct callchain_param *param)
692 {
693 bool function = perf_evsel__is_function_event(evsel);
694 struct perf_event_attr *attr = &evsel->core.attr;
695
696 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
697
698 attr->sample_max_stack = param->max_stack;
699
700 if (opts->kernel_callchains)
701 attr->exclude_callchain_user = 1;
702 if (opts->user_callchains)
703 attr->exclude_callchain_kernel = 1;
704 if (param->record_mode == CALLCHAIN_LBR) {
705 if (!opts->branch_stack) {
706 if (attr->exclude_user) {
707 pr_warning("LBR callstack option is only available "
708 "to get user callchain information. "
709 "Falling back to framepointers.\n");
710 } else {
711 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
712 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
713 PERF_SAMPLE_BRANCH_CALL_STACK |
714 PERF_SAMPLE_BRANCH_NO_CYCLES |
715 PERF_SAMPLE_BRANCH_NO_FLAGS;
716 }
717 } else
718 pr_warning("Cannot use LBR callstack with branch stack. "
719 "Falling back to framepointers.\n");
720 }
721
722 if (param->record_mode == CALLCHAIN_DWARF) {
723 if (!function) {
724 perf_evsel__set_sample_bit(evsel, REGS_USER);
725 perf_evsel__set_sample_bit(evsel, STACK_USER);
726 if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) {
727 attr->sample_regs_user |= DWARF_MINIMAL_REGS;
728 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
729 "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
730 "so the minimal registers set (IP, SP) is explicitly forced.\n");
731 } else {
732 attr->sample_regs_user |= PERF_REGS_MASK;
733 }
734 attr->sample_stack_user = param->dump_size;
735 attr->exclude_callchain_user = 1;
736 } else {
737 pr_info("Cannot use DWARF unwind for function trace event,"
738 " falling back to framepointers.\n");
739 }
740 }
741
742 if (function) {
743 pr_info("Disabling user space callchains for function trace event.\n");
744 attr->exclude_callchain_user = 1;
745 }
746 }
747
748 void perf_evsel__config_callchain(struct evsel *evsel,
749 struct record_opts *opts,
750 struct callchain_param *param)
751 {
752 if (param->enabled)
753 return __perf_evsel__config_callchain(evsel, opts, param);
754 }
755
756 static void
757 perf_evsel__reset_callgraph(struct evsel *evsel,
758 struct callchain_param *param)
759 {
760 struct perf_event_attr *attr = &evsel->core.attr;
761
762 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
763 if (param->record_mode == CALLCHAIN_LBR) {
764 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
765 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
766 PERF_SAMPLE_BRANCH_CALL_STACK);
767 }
768 if (param->record_mode == CALLCHAIN_DWARF) {
769 perf_evsel__reset_sample_bit(evsel, REGS_USER);
770 perf_evsel__reset_sample_bit(evsel, STACK_USER);
771 }
772 }
773
774 static void apply_config_terms(struct evsel *evsel,
775 struct record_opts *opts, bool track)
776 {
777 struct perf_evsel_config_term *term;
778 struct list_head *config_terms = &evsel->config_terms;
779 struct perf_event_attr *attr = &evsel->core.attr;
780 /* callgraph default */
781 struct callchain_param param = {
782 .record_mode = callchain_param.record_mode,
783 };
784 u32 dump_size = 0;
785 int max_stack = 0;
786 const char *callgraph_buf = NULL;
787
788 list_for_each_entry(term, config_terms, list) {
789 switch (term->type) {
790 case PERF_EVSEL__CONFIG_TERM_PERIOD:
791 if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
792 attr->sample_period = term->val.period;
793 attr->freq = 0;
794 perf_evsel__reset_sample_bit(evsel, PERIOD);
795 }
796 break;
797 case PERF_EVSEL__CONFIG_TERM_FREQ:
798 if (!(term->weak && opts->user_freq != UINT_MAX)) {
799 attr->sample_freq = term->val.freq;
800 attr->freq = 1;
801 perf_evsel__set_sample_bit(evsel, PERIOD);
802 }
803 break;
804 case PERF_EVSEL__CONFIG_TERM_TIME:
805 if (term->val.time)
806 perf_evsel__set_sample_bit(evsel, TIME);
807 else
808 perf_evsel__reset_sample_bit(evsel, TIME);
809 break;
810 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
811 callgraph_buf = term->val.callgraph;
812 break;
813 case PERF_EVSEL__CONFIG_TERM_BRANCH:
814 if (term->val.branch && strcmp(term->val.branch, "no")) {
815 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
816 parse_branch_str(term->val.branch,
817 &attr->branch_sample_type);
818 } else
819 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
820 break;
821 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
822 dump_size = term->val.stack_user;
823 break;
824 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
825 max_stack = term->val.max_stack;
826 break;
827 case PERF_EVSEL__CONFIG_TERM_MAX_EVENTS:
828 evsel->max_events = term->val.max_events;
829 break;
830 case PERF_EVSEL__CONFIG_TERM_INHERIT:
831 /*
832 * attr->inherit should has already been set by
833 * perf_evsel__config. If user explicitly set
834 * inherit using config terms, override global
835 * opt->no_inherit setting.
836 */
837 attr->inherit = term->val.inherit ? 1 : 0;
838 break;
839 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
840 attr->write_backward = term->val.overwrite ? 1 : 0;
841 break;
842 case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
843 break;
844 case PERF_EVSEL__CONFIG_TERM_PERCORE:
845 break;
846 case PERF_EVSEL__CONFIG_TERM_AUX_OUTPUT:
847 attr->aux_output = term->val.aux_output ? 1 : 0;
848 break;
849 case PERF_EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
850 /* Already applied by auxtrace */
851 break;
852 case PERF_EVSEL__CONFIG_TERM_CFG_CHG:
853 break;
854 default:
855 break;
856 }
857 }
858
859 /* User explicitly set per-event callgraph, clear the old setting and reset. */
860 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
861 bool sample_address = false;
862
863 if (max_stack) {
864 param.max_stack = max_stack;
865 if (callgraph_buf == NULL)
866 callgraph_buf = "fp";
867 }
868
869 /* parse callgraph parameters */
870 if (callgraph_buf != NULL) {
871 if (!strcmp(callgraph_buf, "no")) {
872 param.enabled = false;
873 param.record_mode = CALLCHAIN_NONE;
874 } else {
875 param.enabled = true;
876 if (parse_callchain_record(callgraph_buf, &param)) {
877 pr_err("per-event callgraph setting for %s failed. "
878 "Apply callgraph global setting for it\n",
879 evsel->name);
880 return;
881 }
882 if (param.record_mode == CALLCHAIN_DWARF)
883 sample_address = true;
884 }
885 }
886 if (dump_size > 0) {
887 dump_size = round_up(dump_size, sizeof(u64));
888 param.dump_size = dump_size;
889 }
890
891 /* If global callgraph set, clear it */
892 if (callchain_param.enabled)
893 perf_evsel__reset_callgraph(evsel, &callchain_param);
894
895 /* set perf-event callgraph */
896 if (param.enabled) {
897 if (sample_address) {
898 perf_evsel__set_sample_bit(evsel, ADDR);
899 perf_evsel__set_sample_bit(evsel, DATA_SRC);
900 evsel->core.attr.mmap_data = track;
901 }
902 perf_evsel__config_callchain(evsel, opts, &param);
903 }
904 }
905 }
906
907 static bool is_dummy_event(struct evsel *evsel)
908 {
909 return (evsel->core.attr.type == PERF_TYPE_SOFTWARE) &&
910 (evsel->core.attr.config == PERF_COUNT_SW_DUMMY);
911 }
912
913 struct perf_evsel_config_term *__perf_evsel__get_config_term(struct evsel *evsel,
914 enum evsel_term_type type)
915 {
916 struct perf_evsel_config_term *term, *found_term = NULL;
917
918 list_for_each_entry(term, &evsel->config_terms, list) {
919 if (term->type == type)
920 found_term = term;
921 }
922
923 return found_term;
924 }
925
926 /*
927 * The enable_on_exec/disabled value strategy:
928 *
929 * 1) For any type of traced program:
930 * - all independent events and group leaders are disabled
931 * - all group members are enabled
932 *
933 * Group members are ruled by group leaders. They need to
934 * be enabled, because the group scheduling relies on that.
935 *
936 * 2) For traced programs executed by perf:
937 * - all independent events and group leaders have
938 * enable_on_exec set
939 * - we don't specifically enable or disable any event during
940 * the record command
941 *
942 * Independent events and group leaders are initially disabled
943 * and get enabled by exec. Group members are ruled by group
944 * leaders as stated in 1).
945 *
946 * 3) For traced programs attached by perf (pid/tid):
947 * - we specifically enable or disable all events during
948 * the record command
949 *
950 * When attaching events to already running traced we
951 * enable/disable events specifically, as there's no
952 * initial traced exec call.
953 */
954 void perf_evsel__config(struct evsel *evsel, struct record_opts *opts,
955 struct callchain_param *callchain)
956 {
957 struct evsel *leader = evsel->leader;
958 struct perf_event_attr *attr = &evsel->core.attr;
959 int track = evsel->tracking;
960 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
961
962 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
963 attr->inherit = !opts->no_inherit;
964 attr->write_backward = opts->overwrite ? 1 : 0;
965
966 perf_evsel__set_sample_bit(evsel, IP);
967 perf_evsel__set_sample_bit(evsel, TID);
968
969 if (evsel->sample_read) {
970 perf_evsel__set_sample_bit(evsel, READ);
971
972 /*
973 * We need ID even in case of single event, because
974 * PERF_SAMPLE_READ process ID specific data.
975 */
976 perf_evsel__set_sample_id(evsel, false);
977
978 /*
979 * Apply group format only if we belong to group
980 * with more than one members.
981 */
982 if (leader->core.nr_members > 1) {
983 attr->read_format |= PERF_FORMAT_GROUP;
984 attr->inherit = 0;
985 }
986 }
987
988 /*
989 * We default some events to have a default interval. But keep
990 * it a weak assumption overridable by the user.
991 */
992 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
993 opts->user_interval != ULLONG_MAX)) {
994 if (opts->freq) {
995 perf_evsel__set_sample_bit(evsel, PERIOD);
996 attr->freq = 1;
997 attr->sample_freq = opts->freq;
998 } else {
999 attr->sample_period = opts->default_interval;
1000 }
1001 }
1002
1003 /*
1004 * Disable sampling for all group members other
1005 * than leader in case leader 'leads' the sampling.
1006 */
1007 if ((leader != evsel) && leader->sample_read) {
1008 attr->freq = 0;
1009 attr->sample_freq = 0;
1010 attr->sample_period = 0;
1011 attr->write_backward = 0;
1012
1013 /*
1014 * We don't get sample for slave events, we make them
1015 * when delivering group leader sample. Set the slave
1016 * event to follow the master sample_type to ease up
1017 * report.
1018 */
1019 attr->sample_type = leader->core.attr.sample_type;
1020 }
1021
1022 if (opts->no_samples)
1023 attr->sample_freq = 0;
1024
1025 if (opts->inherit_stat) {
1026 evsel->core.attr.read_format |=
1027 PERF_FORMAT_TOTAL_TIME_ENABLED |
1028 PERF_FORMAT_TOTAL_TIME_RUNNING |
1029 PERF_FORMAT_ID;
1030 attr->inherit_stat = 1;
1031 }
1032
1033 if (opts->sample_address) {
1034 perf_evsel__set_sample_bit(evsel, ADDR);
1035 attr->mmap_data = track;
1036 }
1037
1038 /*
1039 * We don't allow user space callchains for function trace
1040 * event, due to issues with page faults while tracing page
1041 * fault handler and its overall trickiness nature.
1042 */
1043 if (perf_evsel__is_function_event(evsel))
1044 evsel->core.attr.exclude_callchain_user = 1;
1045
1046 if (callchain && callchain->enabled && !evsel->no_aux_samples)
1047 perf_evsel__config_callchain(evsel, opts, callchain);
1048
1049 if (opts->sample_intr_regs) {
1050 attr->sample_regs_intr = opts->sample_intr_regs;
1051 perf_evsel__set_sample_bit(evsel, REGS_INTR);
1052 }
1053
1054 if (opts->sample_user_regs) {
1055 attr->sample_regs_user |= opts->sample_user_regs;
1056 perf_evsel__set_sample_bit(evsel, REGS_USER);
1057 }
1058
1059 if (target__has_cpu(&opts->target) || opts->sample_cpu)
1060 perf_evsel__set_sample_bit(evsel, CPU);
1061
1062 /*
1063 * When the user explicitly disabled time don't force it here.
1064 */
1065 if (opts->sample_time &&
1066 (!perf_missing_features.sample_id_all &&
1067 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1068 opts->sample_time_set)))
1069 perf_evsel__set_sample_bit(evsel, TIME);
1070
1071 if (opts->raw_samples && !evsel->no_aux_samples) {
1072 perf_evsel__set_sample_bit(evsel, TIME);
1073 perf_evsel__set_sample_bit(evsel, RAW);
1074 perf_evsel__set_sample_bit(evsel, CPU);
1075 }
1076
1077 if (opts->sample_address)
1078 perf_evsel__set_sample_bit(evsel, DATA_SRC);
1079
1080 if (opts->sample_phys_addr)
1081 perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
1082
1083 if (opts->no_buffering) {
1084 attr->watermark = 0;
1085 attr->wakeup_events = 1;
1086 }
1087 if (opts->branch_stack && !evsel->no_aux_samples) {
1088 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
1089 attr->branch_sample_type = opts->branch_stack;
1090 }
1091
1092 if (opts->sample_weight)
1093 perf_evsel__set_sample_bit(evsel, WEIGHT);
1094
1095 attr->task = track;
1096 attr->mmap = track;
1097 attr->mmap2 = track && !perf_missing_features.mmap2;
1098 attr->comm = track;
1099 attr->ksymbol = track && !perf_missing_features.ksymbol;
1100 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1101
1102 if (opts->record_namespaces)
1103 attr->namespaces = track;
1104
1105 if (opts->record_switch_events)
1106 attr->context_switch = track;
1107
1108 if (opts->sample_transaction)
1109 perf_evsel__set_sample_bit(evsel, TRANSACTION);
1110
1111 if (opts->running_time) {
1112 evsel->core.attr.read_format |=
1113 PERF_FORMAT_TOTAL_TIME_ENABLED |
1114 PERF_FORMAT_TOTAL_TIME_RUNNING;
1115 }
1116
1117 /*
1118 * XXX see the function comment above
1119 *
1120 * Disabling only independent events or group leaders,
1121 * keeping group members enabled.
1122 */
1123 if (perf_evsel__is_group_leader(evsel))
1124 attr->disabled = 1;
1125
1126 /*
1127 * Setting enable_on_exec for independent events and
1128 * group leaders for traced executed by perf.
1129 */
1130 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
1131 !opts->initial_delay)
1132 attr->enable_on_exec = 1;
1133
1134 if (evsel->immediate) {
1135 attr->disabled = 0;
1136 attr->enable_on_exec = 0;
1137 }
1138
1139 clockid = opts->clockid;
1140 if (opts->use_clockid) {
1141 attr->use_clockid = 1;
1142 attr->clockid = opts->clockid;
1143 }
1144
1145 if (evsel->precise_max)
1146 attr->precise_ip = 3;
1147
1148 if (opts->all_user) {
1149 attr->exclude_kernel = 1;
1150 attr->exclude_user = 0;
1151 }
1152
1153 if (opts->all_kernel) {
1154 attr->exclude_kernel = 0;
1155 attr->exclude_user = 1;
1156 }
1157
1158 if (evsel->core.own_cpus || evsel->unit)
1159 evsel->core.attr.read_format |= PERF_FORMAT_ID;
1160
1161 /*
1162 * Apply event specific term settings,
1163 * it overloads any global configuration.
1164 */
1165 apply_config_terms(evsel, opts, track);
1166
1167 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1168
1169 /* The --period option takes the precedence. */
1170 if (opts->period_set) {
1171 if (opts->period)
1172 perf_evsel__set_sample_bit(evsel, PERIOD);
1173 else
1174 perf_evsel__reset_sample_bit(evsel, PERIOD);
1175 }
1176
1177 /*
1178 * For initial_delay, a dummy event is added implicitly.
1179 * The software event will trigger -EOPNOTSUPP error out,
1180 * if BRANCH_STACK bit is set.
1181 */
1182 if (opts->initial_delay && is_dummy_event(evsel))
1183 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
1184 }
1185
1186 int perf_evsel__set_filter(struct evsel *evsel, const char *filter)
1187 {
1188 char *new_filter = strdup(filter);
1189
1190 if (new_filter != NULL) {
1191 free(evsel->filter);
1192 evsel->filter = new_filter;
1193 return 0;
1194 }
1195
1196 return -1;
1197 }
1198
1199 static int perf_evsel__append_filter(struct evsel *evsel,
1200 const char *fmt, const char *filter)
1201 {
1202 char *new_filter;
1203
1204 if (evsel->filter == NULL)
1205 return perf_evsel__set_filter(evsel, filter);
1206
1207 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1208 free(evsel->filter);
1209 evsel->filter = new_filter;
1210 return 0;
1211 }
1212
1213 return -1;
1214 }
1215
1216 int perf_evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1217 {
1218 return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1219 }
1220
1221 int perf_evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1222 {
1223 return perf_evsel__append_filter(evsel, "%s,%s", filter);
1224 }
1225
1226 /* Caller has to clear disabled after going through all CPUs. */
1227 int evsel__enable_cpu(struct evsel *evsel, int cpu)
1228 {
1229 return perf_evsel__enable_cpu(&evsel->core, cpu);
1230 }
1231
1232 int evsel__enable(struct evsel *evsel)
1233 {
1234 int err = perf_evsel__enable(&evsel->core);
1235
1236 if (!err)
1237 evsel->disabled = false;
1238 return err;
1239 }
1240
1241 /* Caller has to set disabled after going through all CPUs. */
1242 int evsel__disable_cpu(struct evsel *evsel, int cpu)
1243 {
1244 return perf_evsel__disable_cpu(&evsel->core, cpu);
1245 }
1246
1247 int evsel__disable(struct evsel *evsel)
1248 {
1249 int err = perf_evsel__disable(&evsel->core);
1250 /*
1251 * We mark it disabled here so that tools that disable a event can
1252 * ignore events after they disable it. I.e. the ring buffer may have
1253 * already a few more events queued up before the kernel got the stop
1254 * request.
1255 */
1256 if (!err)
1257 evsel->disabled = true;
1258
1259 return err;
1260 }
1261
1262 static void perf_evsel__free_config_terms(struct evsel *evsel)
1263 {
1264 struct perf_evsel_config_term *term, *h;
1265
1266 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1267 list_del_init(&term->list);
1268 free(term);
1269 }
1270 }
1271
1272 void perf_evsel__exit(struct evsel *evsel)
1273 {
1274 assert(list_empty(&evsel->core.node));
1275 assert(evsel->evlist == NULL);
1276 perf_evsel__free_counts(evsel);
1277 perf_evsel__free_fd(&evsel->core);
1278 perf_evsel__free_id(&evsel->core);
1279 perf_evsel__free_config_terms(evsel);
1280 cgroup__put(evsel->cgrp);
1281 perf_cpu_map__put(evsel->core.cpus);
1282 perf_cpu_map__put(evsel->core.own_cpus);
1283 perf_thread_map__put(evsel->core.threads);
1284 zfree(&evsel->group_name);
1285 zfree(&evsel->name);
1286 perf_evsel__object.fini(evsel);
1287 }
1288
1289 void evsel__delete(struct evsel *evsel)
1290 {
1291 perf_evsel__exit(evsel);
1292 free(evsel);
1293 }
1294
1295 void perf_evsel__compute_deltas(struct evsel *evsel, int cpu, int thread,
1296 struct perf_counts_values *count)
1297 {
1298 struct perf_counts_values tmp;
1299
1300 if (!evsel->prev_raw_counts)
1301 return;
1302
1303 if (cpu == -1) {
1304 tmp = evsel->prev_raw_counts->aggr;
1305 evsel->prev_raw_counts->aggr = *count;
1306 } else {
1307 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1308 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1309 }
1310
1311 count->val = count->val - tmp.val;
1312 count->ena = count->ena - tmp.ena;
1313 count->run = count->run - tmp.run;
1314 }
1315
1316 void perf_counts_values__scale(struct perf_counts_values *count,
1317 bool scale, s8 *pscaled)
1318 {
1319 s8 scaled = 0;
1320
1321 if (scale) {
1322 if (count->run == 0) {
1323 scaled = -1;
1324 count->val = 0;
1325 } else if (count->run < count->ena) {
1326 scaled = 1;
1327 count->val = (u64)((double) count->val * count->ena / count->run);
1328 }
1329 }
1330
1331 if (pscaled)
1332 *pscaled = scaled;
1333 }
1334
1335 static int
1336 perf_evsel__read_one(struct evsel *evsel, int cpu, int thread)
1337 {
1338 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1339
1340 return perf_evsel__read(&evsel->core, cpu, thread, count);
1341 }
1342
1343 static void
1344 perf_evsel__set_count(struct evsel *counter, int cpu, int thread,
1345 u64 val, u64 ena, u64 run)
1346 {
1347 struct perf_counts_values *count;
1348
1349 count = perf_counts(counter->counts, cpu, thread);
1350
1351 count->val = val;
1352 count->ena = ena;
1353 count->run = run;
1354
1355 perf_counts__set_loaded(counter->counts, cpu, thread, true);
1356 }
1357
1358 static int
1359 perf_evsel__process_group_data(struct evsel *leader,
1360 int cpu, int thread, u64 *data)
1361 {
1362 u64 read_format = leader->core.attr.read_format;
1363 struct sample_read_value *v;
1364 u64 nr, ena = 0, run = 0, i;
1365
1366 nr = *data++;
1367
1368 if (nr != (u64) leader->core.nr_members)
1369 return -EINVAL;
1370
1371 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1372 ena = *data++;
1373
1374 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1375 run = *data++;
1376
1377 v = (struct sample_read_value *) data;
1378
1379 perf_evsel__set_count(leader, cpu, thread,
1380 v[0].value, ena, run);
1381
1382 for (i = 1; i < nr; i++) {
1383 struct evsel *counter;
1384
1385 counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1386 if (!counter)
1387 return -EINVAL;
1388
1389 perf_evsel__set_count(counter, cpu, thread,
1390 v[i].value, ena, run);
1391 }
1392
1393 return 0;
1394 }
1395
1396 static int
1397 perf_evsel__read_group(struct evsel *leader, int cpu, int thread)
1398 {
1399 struct perf_stat_evsel *ps = leader->stats;
1400 u64 read_format = leader->core.attr.read_format;
1401 int size = perf_evsel__read_size(&leader->core);
1402 u64 *data = ps->group_data;
1403
1404 if (!(read_format & PERF_FORMAT_ID))
1405 return -EINVAL;
1406
1407 if (!perf_evsel__is_group_leader(leader))
1408 return -EINVAL;
1409
1410 if (!data) {
1411 data = zalloc(size);
1412 if (!data)
1413 return -ENOMEM;
1414
1415 ps->group_data = data;
1416 }
1417
1418 if (FD(leader, cpu, thread) < 0)
1419 return -EINVAL;
1420
1421 if (readn(FD(leader, cpu, thread), data, size) <= 0)
1422 return -errno;
1423
1424 return perf_evsel__process_group_data(leader, cpu, thread, data);
1425 }
1426
1427 int perf_evsel__read_counter(struct evsel *evsel, int cpu, int thread)
1428 {
1429 u64 read_format = evsel->core.attr.read_format;
1430
1431 if (read_format & PERF_FORMAT_GROUP)
1432 return perf_evsel__read_group(evsel, cpu, thread);
1433 else
1434 return perf_evsel__read_one(evsel, cpu, thread);
1435 }
1436
1437 int __perf_evsel__read_on_cpu(struct evsel *evsel,
1438 int cpu, int thread, bool scale)
1439 {
1440 struct perf_counts_values count;
1441 size_t nv = scale ? 3 : 1;
1442
1443 if (FD(evsel, cpu, thread) < 0)
1444 return -EINVAL;
1445
1446 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1447 return -ENOMEM;
1448
1449 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1450 return -errno;
1451
1452 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1453 perf_counts_values__scale(&count, scale, NULL);
1454 *perf_counts(evsel->counts, cpu, thread) = count;
1455 return 0;
1456 }
1457
1458 static int get_group_fd(struct evsel *evsel, int cpu, int thread)
1459 {
1460 struct evsel *leader = evsel->leader;
1461 int fd;
1462
1463 if (perf_evsel__is_group_leader(evsel))
1464 return -1;
1465
1466 /*
1467 * Leader must be already processed/open,
1468 * if not it's a bug.
1469 */
1470 BUG_ON(!leader->core.fd);
1471
1472 fd = FD(leader, cpu, thread);
1473 BUG_ON(fd == -1);
1474
1475 return fd;
1476 }
1477
1478 static void perf_evsel__remove_fd(struct evsel *pos,
1479 int nr_cpus, int nr_threads,
1480 int thread_idx)
1481 {
1482 for (int cpu = 0; cpu < nr_cpus; cpu++)
1483 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1484 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1485 }
1486
1487 static int update_fds(struct evsel *evsel,
1488 int nr_cpus, int cpu_idx,
1489 int nr_threads, int thread_idx)
1490 {
1491 struct evsel *pos;
1492
1493 if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1494 return -EINVAL;
1495
1496 evlist__for_each_entry(evsel->evlist, pos) {
1497 nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1498
1499 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1500
1501 /*
1502 * Since fds for next evsel has not been created,
1503 * there is no need to iterate whole event list.
1504 */
1505 if (pos == evsel)
1506 break;
1507 }
1508 return 0;
1509 }
1510
1511 static bool ignore_missing_thread(struct evsel *evsel,
1512 int nr_cpus, int cpu,
1513 struct perf_thread_map *threads,
1514 int thread, int err)
1515 {
1516 pid_t ignore_pid = perf_thread_map__pid(threads, thread);
1517
1518 if (!evsel->ignore_missing_thread)
1519 return false;
1520
1521 /* The system wide setup does not work with threads. */
1522 if (evsel->core.system_wide)
1523 return false;
1524
1525 /* The -ESRCH is perf event syscall errno for pid's not found. */
1526 if (err != -ESRCH)
1527 return false;
1528
1529 /* If there's only one thread, let it fail. */
1530 if (threads->nr == 1)
1531 return false;
1532
1533 /*
1534 * We should remove fd for missing_thread first
1535 * because thread_map__remove() will decrease threads->nr.
1536 */
1537 if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1538 return false;
1539
1540 if (thread_map__remove(threads, thread))
1541 return false;
1542
1543 pr_warning("WARNING: Ignored open failure for pid %d\n",
1544 ignore_pid);
1545 return true;
1546 }
1547
1548 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1549 void *priv __maybe_unused)
1550 {
1551 return fprintf(fp, " %-32s %s\n", name, val);
1552 }
1553
1554 static void display_attr(struct perf_event_attr *attr)
1555 {
1556 if (verbose >= 2 || debug_peo_args) {
1557 fprintf(stderr, "%.60s\n", graph_dotted_line);
1558 fprintf(stderr, "perf_event_attr:\n");
1559 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1560 fprintf(stderr, "%.60s\n", graph_dotted_line);
1561 }
1562 }
1563
1564 static int perf_event_open(struct evsel *evsel,
1565 pid_t pid, int cpu, int group_fd,
1566 unsigned long flags)
1567 {
1568 int precise_ip = evsel->core.attr.precise_ip;
1569 int fd;
1570
1571 while (1) {
1572 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
1573 pid, cpu, group_fd, flags);
1574
1575 fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, group_fd, flags);
1576 if (fd >= 0)
1577 break;
1578
1579 /* Do not try less precise if not requested. */
1580 if (!evsel->precise_max)
1581 break;
1582
1583 /*
1584 * We tried all the precise_ip values, and it's
1585 * still failing, so leave it to standard fallback.
1586 */
1587 if (!evsel->core.attr.precise_ip) {
1588 evsel->core.attr.precise_ip = precise_ip;
1589 break;
1590 }
1591
1592 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", -ENOTSUP);
1593 evsel->core.attr.precise_ip--;
1594 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
1595 display_attr(&evsel->core.attr);
1596 }
1597
1598 return fd;
1599 }
1600
1601 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
1602 struct perf_thread_map *threads,
1603 int start_cpu, int end_cpu)
1604 {
1605 int cpu, thread, nthreads;
1606 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1607 int pid = -1, err, old_errno;
1608 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1609
1610 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
1611 (perf_missing_features.aux_output && evsel->core.attr.aux_output))
1612 return -EINVAL;
1613
1614 if (cpus == NULL) {
1615 static struct perf_cpu_map *empty_cpu_map;
1616
1617 if (empty_cpu_map == NULL) {
1618 empty_cpu_map = perf_cpu_map__dummy_new();
1619 if (empty_cpu_map == NULL)
1620 return -ENOMEM;
1621 }
1622
1623 cpus = empty_cpu_map;
1624 }
1625
1626 if (threads == NULL) {
1627 static struct perf_thread_map *empty_thread_map;
1628
1629 if (empty_thread_map == NULL) {
1630 empty_thread_map = thread_map__new_by_tid(-1);
1631 if (empty_thread_map == NULL)
1632 return -ENOMEM;
1633 }
1634
1635 threads = empty_thread_map;
1636 }
1637
1638 if (evsel->core.system_wide)
1639 nthreads = 1;
1640 else
1641 nthreads = threads->nr;
1642
1643 if (evsel->core.fd == NULL &&
1644 perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0)
1645 return -ENOMEM;
1646
1647 if (evsel->cgrp) {
1648 flags |= PERF_FLAG_PID_CGROUP;
1649 pid = evsel->cgrp->fd;
1650 }
1651
1652 fallback_missing_features:
1653 if (perf_missing_features.clockid_wrong)
1654 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
1655 if (perf_missing_features.clockid) {
1656 evsel->core.attr.use_clockid = 0;
1657 evsel->core.attr.clockid = 0;
1658 }
1659 if (perf_missing_features.cloexec)
1660 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1661 if (perf_missing_features.mmap2)
1662 evsel->core.attr.mmap2 = 0;
1663 if (perf_missing_features.exclude_guest)
1664 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
1665 if (perf_missing_features.lbr_flags)
1666 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1667 PERF_SAMPLE_BRANCH_NO_CYCLES);
1668 if (perf_missing_features.group_read && evsel->core.attr.inherit)
1669 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1670 if (perf_missing_features.ksymbol)
1671 evsel->core.attr.ksymbol = 0;
1672 if (perf_missing_features.bpf)
1673 evsel->core.attr.bpf_event = 0;
1674 retry_sample_id:
1675 if (perf_missing_features.sample_id_all)
1676 evsel->core.attr.sample_id_all = 0;
1677
1678 display_attr(&evsel->core.attr);
1679
1680 for (cpu = start_cpu; cpu < end_cpu; cpu++) {
1681
1682 for (thread = 0; thread < nthreads; thread++) {
1683 int fd, group_fd;
1684
1685 if (!evsel->cgrp && !evsel->core.system_wide)
1686 pid = perf_thread_map__pid(threads, thread);
1687
1688 group_fd = get_group_fd(evsel, cpu, thread);
1689 retry_open:
1690 test_attr__ready();
1691
1692 fd = perf_event_open(evsel, pid, cpus->map[cpu],
1693 group_fd, flags);
1694
1695 FD(evsel, cpu, thread) = fd;
1696
1697 if (fd < 0) {
1698 err = -errno;
1699
1700 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
1701 /*
1702 * We just removed 1 thread, so take a step
1703 * back on thread index and lower the upper
1704 * nthreads limit.
1705 */
1706 nthreads--;
1707 thread--;
1708
1709 /* ... and pretend like nothing have happened. */
1710 err = 0;
1711 continue;
1712 }
1713
1714 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
1715 err);
1716 goto try_fallback;
1717 }
1718
1719 pr_debug2_peo(" = %d\n", fd);
1720
1721 if (evsel->bpf_fd >= 0) {
1722 int evt_fd = fd;
1723 int bpf_fd = evsel->bpf_fd;
1724
1725 err = ioctl(evt_fd,
1726 PERF_EVENT_IOC_SET_BPF,
1727 bpf_fd);
1728 if (err && errno != EEXIST) {
1729 pr_err("failed to attach bpf fd %d: %s\n",
1730 bpf_fd, strerror(errno));
1731 err = -EINVAL;
1732 goto out_close;
1733 }
1734 }
1735
1736 set_rlimit = NO_CHANGE;
1737
1738 /*
1739 * If we succeeded but had to kill clockid, fail and
1740 * have perf_evsel__open_strerror() print us a nice
1741 * error.
1742 */
1743 if (perf_missing_features.clockid ||
1744 perf_missing_features.clockid_wrong) {
1745 err = -EINVAL;
1746 goto out_close;
1747 }
1748 }
1749 }
1750
1751 return 0;
1752
1753 try_fallback:
1754 /*
1755 * perf stat needs between 5 and 22 fds per CPU. When we run out
1756 * of them try to increase the limits.
1757 */
1758 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1759 struct rlimit l;
1760
1761 old_errno = errno;
1762 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1763 if (set_rlimit == NO_CHANGE)
1764 l.rlim_cur = l.rlim_max;
1765 else {
1766 l.rlim_cur = l.rlim_max + 1000;
1767 l.rlim_max = l.rlim_cur;
1768 }
1769 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1770 set_rlimit++;
1771 errno = old_errno;
1772 goto retry_open;
1773 }
1774 }
1775 errno = old_errno;
1776 }
1777
1778 if (err != -EINVAL || cpu > 0 || thread > 0)
1779 goto out_close;
1780
1781 /*
1782 * Must probe features in the order they were added to the
1783 * perf_event_attr interface.
1784 */
1785 if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
1786 perf_missing_features.aux_output = true;
1787 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n");
1788 goto out_close;
1789 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) {
1790 perf_missing_features.bpf = true;
1791 pr_debug2_peo("switching off bpf_event\n");
1792 goto fallback_missing_features;
1793 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) {
1794 perf_missing_features.ksymbol = true;
1795 pr_debug2_peo("switching off ksymbol\n");
1796 goto fallback_missing_features;
1797 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) {
1798 perf_missing_features.write_backward = true;
1799 pr_debug2_peo("switching off write_backward\n");
1800 goto out_close;
1801 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) {
1802 perf_missing_features.clockid_wrong = true;
1803 pr_debug2_peo("switching off clockid\n");
1804 goto fallback_missing_features;
1805 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) {
1806 perf_missing_features.clockid = true;
1807 pr_debug2_peo("switching off use_clockid\n");
1808 goto fallback_missing_features;
1809 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1810 perf_missing_features.cloexec = true;
1811 pr_debug2_peo("switching off cloexec flag\n");
1812 goto fallback_missing_features;
1813 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) {
1814 perf_missing_features.mmap2 = true;
1815 pr_debug2_peo("switching off mmap2\n");
1816 goto fallback_missing_features;
1817 } else if (!perf_missing_features.exclude_guest &&
1818 (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) {
1819 perf_missing_features.exclude_guest = true;
1820 pr_debug2_peo("switching off exclude_guest, exclude_host\n");
1821 goto fallback_missing_features;
1822 } else if (!perf_missing_features.sample_id_all) {
1823 perf_missing_features.sample_id_all = true;
1824 pr_debug2_peo("switching off sample_id_all\n");
1825 goto retry_sample_id;
1826 } else if (!perf_missing_features.lbr_flags &&
1827 (evsel->core.attr.branch_sample_type &
1828 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1829 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1830 perf_missing_features.lbr_flags = true;
1831 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
1832 goto fallback_missing_features;
1833 } else if (!perf_missing_features.group_read &&
1834 evsel->core.attr.inherit &&
1835 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
1836 perf_evsel__is_group_leader(evsel)) {
1837 perf_missing_features.group_read = true;
1838 pr_debug2_peo("switching off group read\n");
1839 goto fallback_missing_features;
1840 }
1841 out_close:
1842 if (err)
1843 threads->err_thread = thread;
1844
1845 old_errno = errno;
1846 do {
1847 while (--thread >= 0) {
1848 if (FD(evsel, cpu, thread) >= 0)
1849 close(FD(evsel, cpu, thread));
1850 FD(evsel, cpu, thread) = -1;
1851 }
1852 thread = nthreads;
1853 } while (--cpu >= 0);
1854 errno = old_errno;
1855 return err;
1856 }
1857
1858 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
1859 struct perf_thread_map *threads)
1860 {
1861 return evsel__open_cpu(evsel, cpus, threads, 0, cpus ? cpus->nr : 1);
1862 }
1863
1864 void evsel__close(struct evsel *evsel)
1865 {
1866 perf_evsel__close(&evsel->core);
1867 perf_evsel__free_id(&evsel->core);
1868 }
1869
1870 int perf_evsel__open_per_cpu(struct evsel *evsel,
1871 struct perf_cpu_map *cpus,
1872 int cpu)
1873 {
1874 if (cpu == -1)
1875 return evsel__open_cpu(evsel, cpus, NULL, 0,
1876 cpus ? cpus->nr : 1);
1877
1878 return evsel__open_cpu(evsel, cpus, NULL, cpu, cpu + 1);
1879 }
1880
1881 int perf_evsel__open_per_thread(struct evsel *evsel,
1882 struct perf_thread_map *threads)
1883 {
1884 return evsel__open(evsel, NULL, threads);
1885 }
1886
1887 static int perf_evsel__parse_id_sample(const struct evsel *evsel,
1888 const union perf_event *event,
1889 struct perf_sample *sample)
1890 {
1891 u64 type = evsel->core.attr.sample_type;
1892 const __u64 *array = event->sample.array;
1893 bool swapped = evsel->needs_swap;
1894 union u64_swap u;
1895
1896 array += ((event->header.size -
1897 sizeof(event->header)) / sizeof(u64)) - 1;
1898
1899 if (type & PERF_SAMPLE_IDENTIFIER) {
1900 sample->id = *array;
1901 array--;
1902 }
1903
1904 if (type & PERF_SAMPLE_CPU) {
1905 u.val64 = *array;
1906 if (swapped) {
1907 /* undo swap of u64, then swap on individual u32s */
1908 u.val64 = bswap_64(u.val64);
1909 u.val32[0] = bswap_32(u.val32[0]);
1910 }
1911
1912 sample->cpu = u.val32[0];
1913 array--;
1914 }
1915
1916 if (type & PERF_SAMPLE_STREAM_ID) {
1917 sample->stream_id = *array;
1918 array--;
1919 }
1920
1921 if (type & PERF_SAMPLE_ID) {
1922 sample->id = *array;
1923 array--;
1924 }
1925
1926 if (type & PERF_SAMPLE_TIME) {
1927 sample->time = *array;
1928 array--;
1929 }
1930
1931 if (type & PERF_SAMPLE_TID) {
1932 u.val64 = *array;
1933 if (swapped) {
1934 /* undo swap of u64, then swap on individual u32s */
1935 u.val64 = bswap_64(u.val64);
1936 u.val32[0] = bswap_32(u.val32[0]);
1937 u.val32[1] = bswap_32(u.val32[1]);
1938 }
1939
1940 sample->pid = u.val32[0];
1941 sample->tid = u.val32[1];
1942 array--;
1943 }
1944
1945 return 0;
1946 }
1947
1948 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1949 u64 size)
1950 {
1951 return size > max_size || offset + size > endp;
1952 }
1953
1954 #define OVERFLOW_CHECK(offset, size, max_size) \
1955 do { \
1956 if (overflow(endp, (max_size), (offset), (size))) \
1957 return -EFAULT; \
1958 } while (0)
1959
1960 #define OVERFLOW_CHECK_u64(offset) \
1961 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1962
1963 static int
1964 perf_event__check_size(union perf_event *event, unsigned int sample_size)
1965 {
1966 /*
1967 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1968 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1969 * check the format does not go past the end of the event.
1970 */
1971 if (sample_size + sizeof(event->header) > event->header.size)
1972 return -EFAULT;
1973
1974 return 0;
1975 }
1976
1977 int perf_evsel__parse_sample(struct evsel *evsel, union perf_event *event,
1978 struct perf_sample *data)
1979 {
1980 u64 type = evsel->core.attr.sample_type;
1981 bool swapped = evsel->needs_swap;
1982 const __u64 *array;
1983 u16 max_size = event->header.size;
1984 const void *endp = (void *)event + max_size;
1985 u64 sz;
1986
1987 /*
1988 * used for cross-endian analysis. See git commit 65014ab3
1989 * for why this goofiness is needed.
1990 */
1991 union u64_swap u;
1992
1993 memset(data, 0, sizeof(*data));
1994 data->cpu = data->pid = data->tid = -1;
1995 data->stream_id = data->id = data->time = -1ULL;
1996 data->period = evsel->core.attr.sample_period;
1997 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1998 data->misc = event->header.misc;
1999 data->id = -1ULL;
2000 data->data_src = PERF_MEM_DATA_SRC_NONE;
2001
2002 if (event->header.type != PERF_RECORD_SAMPLE) {
2003 if (!evsel->core.attr.sample_id_all)
2004 return 0;
2005 return perf_evsel__parse_id_sample(evsel, event, data);
2006 }
2007
2008 array = event->sample.array;
2009
2010 if (perf_event__check_size(event, evsel->sample_size))
2011 return -EFAULT;
2012
2013 if (type & PERF_SAMPLE_IDENTIFIER) {
2014 data->id = *array;
2015 array++;
2016 }
2017
2018 if (type & PERF_SAMPLE_IP) {
2019 data->ip = *array;
2020 array++;
2021 }
2022
2023 if (type & PERF_SAMPLE_TID) {
2024 u.val64 = *array;
2025 if (swapped) {
2026 /* undo swap of u64, then swap on individual u32s */
2027 u.val64 = bswap_64(u.val64);
2028 u.val32[0] = bswap_32(u.val32[0]);
2029 u.val32[1] = bswap_32(u.val32[1]);
2030 }
2031
2032 data->pid = u.val32[0];
2033 data->tid = u.val32[1];
2034 array++;
2035 }
2036
2037 if (type & PERF_SAMPLE_TIME) {
2038 data->time = *array;
2039 array++;
2040 }
2041
2042 if (type & PERF_SAMPLE_ADDR) {
2043 data->addr = *array;
2044 array++;
2045 }
2046
2047 if (type & PERF_SAMPLE_ID) {
2048 data->id = *array;
2049 array++;
2050 }
2051
2052 if (type & PERF_SAMPLE_STREAM_ID) {
2053 data->stream_id = *array;
2054 array++;
2055 }
2056
2057 if (type & PERF_SAMPLE_CPU) {
2058
2059 u.val64 = *array;
2060 if (swapped) {
2061 /* undo swap of u64, then swap on individual u32s */
2062 u.val64 = bswap_64(u.val64);
2063 u.val32[0] = bswap_32(u.val32[0]);
2064 }
2065
2066 data->cpu = u.val32[0];
2067 array++;
2068 }
2069
2070 if (type & PERF_SAMPLE_PERIOD) {
2071 data->period = *array;
2072 array++;
2073 }
2074
2075 if (type & PERF_SAMPLE_READ) {
2076 u64 read_format = evsel->core.attr.read_format;
2077
2078 OVERFLOW_CHECK_u64(array);
2079 if (read_format & PERF_FORMAT_GROUP)
2080 data->read.group.nr = *array;
2081 else
2082 data->read.one.value = *array;
2083
2084 array++;
2085
2086 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2087 OVERFLOW_CHECK_u64(array);
2088 data->read.time_enabled = *array;
2089 array++;
2090 }
2091
2092 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2093 OVERFLOW_CHECK_u64(array);
2094 data->read.time_running = *array;
2095 array++;
2096 }
2097
2098 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2099 if (read_format & PERF_FORMAT_GROUP) {
2100 const u64 max_group_nr = UINT64_MAX /
2101 sizeof(struct sample_read_value);
2102
2103 if (data->read.group.nr > max_group_nr)
2104 return -EFAULT;
2105 sz = data->read.group.nr *
2106 sizeof(struct sample_read_value);
2107 OVERFLOW_CHECK(array, sz, max_size);
2108 data->read.group.values =
2109 (struct sample_read_value *)array;
2110 array = (void *)array + sz;
2111 } else {
2112 OVERFLOW_CHECK_u64(array);
2113 data->read.one.id = *array;
2114 array++;
2115 }
2116 }
2117
2118 if (evsel__has_callchain(evsel)) {
2119 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2120
2121 OVERFLOW_CHECK_u64(array);
2122 data->callchain = (struct ip_callchain *)array++;
2123 if (data->callchain->nr > max_callchain_nr)
2124 return -EFAULT;
2125 sz = data->callchain->nr * sizeof(u64);
2126 OVERFLOW_CHECK(array, sz, max_size);
2127 array = (void *)array + sz;
2128 }
2129
2130 if (type & PERF_SAMPLE_RAW) {
2131 OVERFLOW_CHECK_u64(array);
2132 u.val64 = *array;
2133
2134 /*
2135 * Undo swap of u64, then swap on individual u32s,
2136 * get the size of the raw area and undo all of the
2137 * swap. The pevent interface handles endianity by
2138 * itself.
2139 */
2140 if (swapped) {
2141 u.val64 = bswap_64(u.val64);
2142 u.val32[0] = bswap_32(u.val32[0]);
2143 u.val32[1] = bswap_32(u.val32[1]);
2144 }
2145 data->raw_size = u.val32[0];
2146
2147 /*
2148 * The raw data is aligned on 64bits including the
2149 * u32 size, so it's safe to use mem_bswap_64.
2150 */
2151 if (swapped)
2152 mem_bswap_64((void *) array, data->raw_size);
2153
2154 array = (void *)array + sizeof(u32);
2155
2156 OVERFLOW_CHECK(array, data->raw_size, max_size);
2157 data->raw_data = (void *)array;
2158 array = (void *)array + data->raw_size;
2159 }
2160
2161 if (type & PERF_SAMPLE_BRANCH_STACK) {
2162 const u64 max_branch_nr = UINT64_MAX /
2163 sizeof(struct branch_entry);
2164
2165 OVERFLOW_CHECK_u64(array);
2166 data->branch_stack = (struct branch_stack *)array++;
2167
2168 if (data->branch_stack->nr > max_branch_nr)
2169 return -EFAULT;
2170 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2171 OVERFLOW_CHECK(array, sz, max_size);
2172 array = (void *)array + sz;
2173 }
2174
2175 if (type & PERF_SAMPLE_REGS_USER) {
2176 OVERFLOW_CHECK_u64(array);
2177 data->user_regs.abi = *array;
2178 array++;
2179
2180 if (data->user_regs.abi) {
2181 u64 mask = evsel->core.attr.sample_regs_user;
2182
2183 sz = hweight64(mask) * sizeof(u64);
2184 OVERFLOW_CHECK(array, sz, max_size);
2185 data->user_regs.mask = mask;
2186 data->user_regs.regs = (u64 *)array;
2187 array = (void *)array + sz;
2188 }
2189 }
2190
2191 if (type & PERF_SAMPLE_STACK_USER) {
2192 OVERFLOW_CHECK_u64(array);
2193 sz = *array++;
2194
2195 data->user_stack.offset = ((char *)(array - 1)
2196 - (char *) event);
2197
2198 if (!sz) {
2199 data->user_stack.size = 0;
2200 } else {
2201 OVERFLOW_CHECK(array, sz, max_size);
2202 data->user_stack.data = (char *)array;
2203 array = (void *)array + sz;
2204 OVERFLOW_CHECK_u64(array);
2205 data->user_stack.size = *array++;
2206 if (WARN_ONCE(data->user_stack.size > sz,
2207 "user stack dump failure\n"))
2208 return -EFAULT;
2209 }
2210 }
2211
2212 if (type & PERF_SAMPLE_WEIGHT) {
2213 OVERFLOW_CHECK_u64(array);
2214 data->weight = *array;
2215 array++;
2216 }
2217
2218 if (type & PERF_SAMPLE_DATA_SRC) {
2219 OVERFLOW_CHECK_u64(array);
2220 data->data_src = *array;
2221 array++;
2222 }
2223
2224 if (type & PERF_SAMPLE_TRANSACTION) {
2225 OVERFLOW_CHECK_u64(array);
2226 data->transaction = *array;
2227 array++;
2228 }
2229
2230 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2231 if (type & PERF_SAMPLE_REGS_INTR) {
2232 OVERFLOW_CHECK_u64(array);
2233 data->intr_regs.abi = *array;
2234 array++;
2235
2236 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2237 u64 mask = evsel->core.attr.sample_regs_intr;
2238
2239 sz = hweight64(mask) * sizeof(u64);
2240 OVERFLOW_CHECK(array, sz, max_size);
2241 data->intr_regs.mask = mask;
2242 data->intr_regs.regs = (u64 *)array;
2243 array = (void *)array + sz;
2244 }
2245 }
2246
2247 data->phys_addr = 0;
2248 if (type & PERF_SAMPLE_PHYS_ADDR) {
2249 data->phys_addr = *array;
2250 array++;
2251 }
2252
2253 if (type & PERF_SAMPLE_AUX) {
2254 OVERFLOW_CHECK_u64(array);
2255 sz = *array++;
2256
2257 OVERFLOW_CHECK(array, sz, max_size);
2258 /* Undo swap of data */
2259 if (swapped)
2260 mem_bswap_64((char *)array, sz);
2261 data->aux_sample.size = sz;
2262 data->aux_sample.data = (char *)array;
2263 array = (void *)array + sz;
2264 }
2265
2266 return 0;
2267 }
2268
2269 int perf_evsel__parse_sample_timestamp(struct evsel *evsel,
2270 union perf_event *event,
2271 u64 *timestamp)
2272 {
2273 u64 type = evsel->core.attr.sample_type;
2274 const __u64 *array;
2275
2276 if (!(type & PERF_SAMPLE_TIME))
2277 return -1;
2278
2279 if (event->header.type != PERF_RECORD_SAMPLE) {
2280 struct perf_sample data = {
2281 .time = -1ULL,
2282 };
2283
2284 if (!evsel->core.attr.sample_id_all)
2285 return -1;
2286 if (perf_evsel__parse_id_sample(evsel, event, &data))
2287 return -1;
2288
2289 *timestamp = data.time;
2290 return 0;
2291 }
2292
2293 array = event->sample.array;
2294
2295 if (perf_event__check_size(event, evsel->sample_size))
2296 return -EFAULT;
2297
2298 if (type & PERF_SAMPLE_IDENTIFIER)
2299 array++;
2300
2301 if (type & PERF_SAMPLE_IP)
2302 array++;
2303
2304 if (type & PERF_SAMPLE_TID)
2305 array++;
2306
2307 if (type & PERF_SAMPLE_TIME)
2308 *timestamp = *array;
2309
2310 return 0;
2311 }
2312
2313 struct tep_format_field *perf_evsel__field(struct evsel *evsel, const char *name)
2314 {
2315 return tep_find_field(evsel->tp_format, name);
2316 }
2317
2318 void *perf_evsel__rawptr(struct evsel *evsel, struct perf_sample *sample,
2319 const char *name)
2320 {
2321 struct tep_format_field *field = perf_evsel__field(evsel, name);
2322 int offset;
2323
2324 if (!field)
2325 return NULL;
2326
2327 offset = field->offset;
2328
2329 if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2330 offset = *(int *)(sample->raw_data + field->offset);
2331 offset &= 0xffff;
2332 }
2333
2334 return sample->raw_data + offset;
2335 }
2336
2337 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2338 bool needs_swap)
2339 {
2340 u64 value;
2341 void *ptr = sample->raw_data + field->offset;
2342
2343 switch (field->size) {
2344 case 1:
2345 return *(u8 *)ptr;
2346 case 2:
2347 value = *(u16 *)ptr;
2348 break;
2349 case 4:
2350 value = *(u32 *)ptr;
2351 break;
2352 case 8:
2353 memcpy(&value, ptr, sizeof(u64));
2354 break;
2355 default:
2356 return 0;
2357 }
2358
2359 if (!needs_swap)
2360 return value;
2361
2362 switch (field->size) {
2363 case 2:
2364 return bswap_16(value);
2365 case 4:
2366 return bswap_32(value);
2367 case 8:
2368 return bswap_64(value);
2369 default:
2370 return 0;
2371 }
2372
2373 return 0;
2374 }
2375
2376 u64 perf_evsel__intval(struct evsel *evsel, struct perf_sample *sample,
2377 const char *name)
2378 {
2379 struct tep_format_field *field = perf_evsel__field(evsel, name);
2380
2381 if (!field)
2382 return 0;
2383
2384 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2385 }
2386
2387 bool perf_evsel__fallback(struct evsel *evsel, int err,
2388 char *msg, size_t msgsize)
2389 {
2390 int paranoid;
2391
2392 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2393 evsel->core.attr.type == PERF_TYPE_HARDWARE &&
2394 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2395 /*
2396 * If it's cycles then fall back to hrtimer based
2397 * cpu-clock-tick sw counter, which is always available even if
2398 * no PMU support.
2399 *
2400 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2401 * b0a873e).
2402 */
2403 scnprintf(msg, msgsize, "%s",
2404 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2405
2406 evsel->core.attr.type = PERF_TYPE_SOFTWARE;
2407 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK;
2408
2409 zfree(&evsel->name);
2410 return true;
2411 } else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
2412 (paranoid = perf_event_paranoid()) > 1) {
2413 const char *name = perf_evsel__name(evsel);
2414 char *new_name;
2415 const char *sep = ":";
2416
2417 /* Is there already the separator in the name. */
2418 if (strchr(name, '/') ||
2419 strchr(name, ':'))
2420 sep = "";
2421
2422 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2423 return false;
2424
2425 if (evsel->name)
2426 free(evsel->name);
2427 evsel->name = new_name;
2428 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
2429 "to fall back to excluding kernel and hypervisor "
2430 " samples", paranoid);
2431 evsel->core.attr.exclude_kernel = 1;
2432 evsel->core.attr.exclude_hv = 1;
2433
2434 return true;
2435 }
2436
2437 return false;
2438 }
2439
2440 static bool find_process(const char *name)
2441 {
2442 size_t len = strlen(name);
2443 DIR *dir;
2444 struct dirent *d;
2445 int ret = -1;
2446
2447 dir = opendir(procfs__mountpoint());
2448 if (!dir)
2449 return false;
2450
2451 /* Walk through the directory. */
2452 while (ret && (d = readdir(dir)) != NULL) {
2453 char path[PATH_MAX];
2454 char *data;
2455 size_t size;
2456
2457 if ((d->d_type != DT_DIR) ||
2458 !strcmp(".", d->d_name) ||
2459 !strcmp("..", d->d_name))
2460 continue;
2461
2462 scnprintf(path, sizeof(path), "%s/%s/comm",
2463 procfs__mountpoint(), d->d_name);
2464
2465 if (filename__read_str(path, &data, &size))
2466 continue;
2467
2468 ret = strncmp(name, data, len);
2469 free(data);
2470 }
2471
2472 closedir(dir);
2473 return ret ? false : true;
2474 }
2475
2476 int perf_evsel__open_strerror(struct evsel *evsel, struct target *target,
2477 int err, char *msg, size_t size)
2478 {
2479 char sbuf[STRERR_BUFSIZE];
2480 int printed = 0;
2481
2482 switch (err) {
2483 case EPERM:
2484 case EACCES:
2485 if (err == EPERM)
2486 printed = scnprintf(msg, size,
2487 "No permission to enable %s event.\n\n",
2488 perf_evsel__name(evsel));
2489
2490 return scnprintf(msg + printed, size - printed,
2491 "You may not have permission to collect %sstats.\n\n"
2492 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2493 "which controls use of the performance events system by\n"
2494 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2495 "The current value is %d:\n\n"
2496 " -1: Allow use of (almost) all events by all users\n"
2497 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2498 ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
2499 " Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
2500 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2501 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2502 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2503 " kernel.perf_event_paranoid = -1\n" ,
2504 target->system_wide ? "system-wide " : "",
2505 perf_event_paranoid());
2506 case ENOENT:
2507 return scnprintf(msg, size, "The %s event is not supported.",
2508 perf_evsel__name(evsel));
2509 case EMFILE:
2510 return scnprintf(msg, size, "%s",
2511 "Too many events are opened.\n"
2512 "Probably the maximum number of open file descriptors has been reached.\n"
2513 "Hint: Try again after reducing the number of events.\n"
2514 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2515 case ENOMEM:
2516 if (evsel__has_callchain(evsel) &&
2517 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2518 return scnprintf(msg, size,
2519 "Not enough memory to setup event with callchain.\n"
2520 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2521 "Hint: Current value: %d", sysctl__max_stack());
2522 break;
2523 case ENODEV:
2524 if (target->cpu_list)
2525 return scnprintf(msg, size, "%s",
2526 "No such device - did you specify an out-of-range profile CPU?");
2527 break;
2528 case EOPNOTSUPP:
2529 if (evsel->core.attr.sample_period != 0)
2530 return scnprintf(msg, size,
2531 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
2532 perf_evsel__name(evsel));
2533 if (evsel->core.attr.precise_ip)
2534 return scnprintf(msg, size, "%s",
2535 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2536 #if defined(__i386__) || defined(__x86_64__)
2537 if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
2538 return scnprintf(msg, size, "%s",
2539 "No hardware sampling interrupt available.\n");
2540 #endif
2541 break;
2542 case EBUSY:
2543 if (find_process("oprofiled"))
2544 return scnprintf(msg, size,
2545 "The PMU counters are busy/taken by another profiler.\n"
2546 "We found oprofile daemon running, please stop it and try again.");
2547 break;
2548 case EINVAL:
2549 if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
2550 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2551 if (perf_missing_features.clockid)
2552 return scnprintf(msg, size, "clockid feature not supported.");
2553 if (perf_missing_features.clockid_wrong)
2554 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2555 if (perf_missing_features.aux_output)
2556 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
2557 break;
2558 default:
2559 break;
2560 }
2561
2562 return scnprintf(msg, size,
2563 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2564 "/bin/dmesg | grep -i perf may provide additional information.\n",
2565 err, str_error_r(err, sbuf, sizeof(sbuf)),
2566 perf_evsel__name(evsel));
2567 }
2568
2569 struct perf_env *perf_evsel__env(struct evsel *evsel)
2570 {
2571 if (evsel && evsel->evlist)
2572 return evsel->evlist->env;
2573 return &perf_env;
2574 }
2575
2576 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
2577 {
2578 int cpu, thread;
2579
2580 for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) {
2581 for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
2582 thread++) {
2583 int fd = FD(evsel, cpu, thread);
2584
2585 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
2586 cpu, thread, fd) < 0)
2587 return -1;
2588 }
2589 }
2590
2591 return 0;
2592 }
2593
2594 int perf_evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
2595 {
2596 struct perf_cpu_map *cpus = evsel->core.cpus;
2597 struct perf_thread_map *threads = evsel->core.threads;
2598
2599 if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr))
2600 return -ENOMEM;
2601
2602 return store_evsel_ids(evsel, evlist);
2603 }
Linux with added FPC-III support